Tidlegare arrangement - Side 108
Abstract: What links a baby’s first breath to adhesive debonding, enhanced oil recovery, filtration or multiphase microfluidics? These processes all involve two-phase flows in rigid or elastic confined vessels and are often prone to interfacial instabilities. The canonical viscous fingering instability, which occurs when air displaces a viscous fluid in the narrow gap between two parallel plates, offers a versatile testbed for such phenomena. In this talk, I will use both experiments and numerical simulations of depth-averaged models to explore several aspects of bubble dynamics in Hele-Shaw cells. I will first show how the onset of fingering can be suppressed when replacing the upper plate of the vessel with an elastic sheet. Interfacial flows in narrow gaps can also exhibit considerable disorder, but they are rarely investigated from a dynamical systems’ perspective. I will show how compliance can promote rich multiplicity of front propagation modes in a channel before turning to bubble propagation in a rigid channel with a depth perturbation. There I will explore how the bubble’s organised transient dynamics is orchestrated by weakly-unstable steady propagation modes, and how its long-term behaviour may be practically unpredictable.
This talk is part of the Mechanics Lunch Seminar series. Bring-your-own-lunch and lots of questions. Hybrid format via Zoom possible on demand (contact timokoch at uio.no)
Is it difficult to set aside time to write? The Academic Writing Centre arranges joint, structured “Shut Up & Write” sessions.
Welcome to the first-ever Life Science Growth House innovation hangout – a new meeting place for academia and industry. This hangout is a collaboration with Oslo Cancer Cluster. Topic: Tomorrow´s treatment – advancing innovations from academia to industry in cancer and beyond.
Biological effects of host defence peptides; templates for future medicine.
Title: Towards kilometre-scale global modelling: challenges for cloud and precipitation
Speaker: Richard Forbes, ECMWF
Welcome to our weekly lunch seminar held in the dScience lounge area! This event is open to PhD candidates and postdocs.
Hvordan løser storsamfunnet dilemmaer knyttet til livssynsbaserte utdanningsinstitusjoner; dilemmaer som oppstår i institusjonenes møte med religiøse og seksuelle minoriteter, eller når institusjonene utfordrer samfunnets verdisyn slik dette er nedfelt i lov- og regelverk om høyere utdanning? Dette fagseminaret etterfølges av en panelsamtale om friskoler og skeive på Litteraturhuset kl. 19.00.
Characterization of the substrate interaction sites in factor seven activating protease (FSAP)
Doctoral candidate Knut Kjetil Holgeid at the Department of Informatics, Faculty of Mathematics and Natural Sciences, is defending the thesis Benefits from Investments in IT Development for the degree of Philosophiae Doctor.
"ortho-Functionalization of 8-hydroxyphenanthridines - Synthesis directed towards Lycorine alkaloids"
Every second Tuesday, CBA members gather for lunch and a talk. On April 19th 2022, the talk will be given by postdoctoral researcher Devaraju Narayanappa about "Green-blue link made browner: Modeling the lateral flow of dissolved organic carbon"
Doctoral candidate Giovanni Domenico Di Salvo at the Department of Mathematics, Faculty of Mathematics and Natural Sciences, is defending the thesis Proper Holomorphic Embeddings of open Riemann Surfaces into C2 and holomorphic mappings between complex manifolds with dense images for the degree of Philosophiae Doctor.
Abstract: A random, labyrinthine pattern emerges during slow drainage of a granular-fluid system in two- dimensional confinement. Compacted grains are pushed ahead of the fluid-air interface, which becomes unstable due to a competition between capillary forces and the frictional stress mobilized by grain-grain contact networks. We reproduce the pattern formation process in numerical simulations and present an analytical treatment that predicts the characteristic length scale of the labyrinth structure. The pattern length scale decreases with increasing volume fraction of grains in the system and increases with the system thickness. By tilting the model, aligned finger structures, with a characteristic width, emerge. A transition from vertical to horizontal alignment of the finger structures is observed as the tilting angle and the granular density are varied. The dynamics is reproduced in simulations. We also show how the system may explain patterns observed in nature, created during the early stages of a dike formation.
This talk is part of the Mechanics Lunch Seminar series. Bring-your-own-lunch and lots of questions. Hybrid format via Zoom possible on demand (contact timokoch at uio.no)
Welcome to our GEOHYD Lunch Seminar Friday 8th of April @ 12:15 in Aud. 2, Geology building or via videolink using Zoom. The seminar is helt by Cassie Wells Lumbrazo, University of Washington.
Michaela Brchnelova, KU Leuven, Belgium.
Is it difficult to set aside time to write? The Academic Writing Centre arranges joint, structured “Shut Up & Write” sessions.
Title: Constraining atmospheric micro plastics.
Speaker: Natalie M. Mahowald, Cornell University
Fysikk og ELITE-studenter på 2020 og 2021-kullet er invitert til en liten boost rett før påskeferien!
C*-algebra seminar by Alexander Stolin
This week we discuss a paper by Hernandez-Castro et al. 2022, on dispersal and adaptation in the Chagas disease vector R. Ecuadoriensis
Classification of Aurora Borealis Using Svalbard All-Sky Imager Data and EfficientNet Convolutional Neural Network
Doctoral candidate Cise Midoglu at the Department of Informatics, Faculty of Mathematics and Natural Sciences, is defending the thesis Empirical Analysis of QoS and QoE in Mobile Broadband Networks for the degree of Philosophiae Doctor.
Associate Professor Fredrik S. Hage, the Structure Physics section
Welcome to our dScience lunch seminar in the Science Library! This event is open to everyone.